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ASTM C-309

Standard Specifications for Liquid Membrane Forming Curing Compounds and Curing and Sealing Compounds.

The most common concrete curing specification in use today. States that the compound must form a membrane and have moisture retention properties equalling 0.55 Kg/M2 in 72 hours when applied at 200 Ft.2 per gallon. Compounds are classified according to type and class.

TYPE refers to color only

Class refers to the kind of resin solids used in the compound

If a curing compound is said to be Class B, it is also considered to be an A.